Losing weight can be one of the healthiest things you do — or one of the most harmful, depending entirely on how you do it. Here's what the science says about safe versus dangerous weight loss approaches.
NICE recommends 0.5–1kg/week as the target rate for sustainable weight loss. Faster rates increase risks including lean mass loss, gallstone formation, and metabolic adaptation. This article reviews the evidence on safe rates, physiological consequences of excess speed, and clinical circumstances where faster loss is medically supervised.